So the 1972 could be real ,and worth something because the forum site is helpful because it looks like one of the comments made that it was stuck...
I found a quarter 1972 with half the date and on the back quarter dollar half missing but that odd part is it looks like all coper and the edge is...
But it's close to the 1973 miss printend one I seen on the Internet
I have a 1972 that looks like the could have been stuck and the corners are round and no notching on a regular quarter and is pure copper ......
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